﻿char letter = 'a';
char digit = '4';

var isUppercase = char.IsUpper(letter);
var isDigit = char.IsDigit(digit);

char someChar = (char)100;
int asInt = (int)'t';

for (char c = 'A'; c < 'z'; ++c)
{
    Console.Write(c + " ");
}

Console.ReadKey();